function toggle(div_id) {
	  var el = document.getElementById(div_id);
	  if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	  else {el.style.display = 'none';}
  }
  function blanket_size(popUpDivVar) {
	  if (typeof window.innerWidth != 'undefined') {
		  viewportheight = window.innerHeight;
	  } else {
		  viewportheight = document.documentElement.clientHeight;
	  }
	  if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		  blanket_height = viewportheight;
	  } else {
		  if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			  blanket_height = document.body.parentNode.clientHeight;
		  } else {
			  blanket_height = document.body.parentNode.scrollHeight;
		  }
	  }
	  var blanket = document.getElementById('blanket');
	  blanket.style.height = blanket_height + 'px';
	  var popUpDiv = document.getElementById(popUpDivVar);
	  popUpDiv_height=blanket_height/2-180;//150 is half popup's height
	  popUpDiv.style.top = popUpDiv_height + 'px';


  }
  function window_pos(popUpDivVar) {
	  if (typeof window.innerWidth != 'undefined') {
		  viewportwidth = window.innerHeight;
	  } else {
		  viewportwidth = document.documentElement.clientHeight;
	  }
	  if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		  window_width = viewportwidth;
	  } else {
		  if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			  window_width = document.body.parentNode.clientWidth;
		  } else {
			  window_width = document.body.parentNode.scrollWidth;
		  }
	  }
	  var popUpDiv = document.getElementById(popUpDivVar);
	  window_width=window_width/2-350;//150 is half popup's width
	  popUpDiv.style.left = window_width + 'px';

  }
  
  function div_popup(windowname,w,h) 
  {
	  
	  blanket_size(windowname);
	  window_pos(windowname);
	  toggle('blanket');
	  toggle(windowname);		
	  var popUp = document.getElementById(windowname); 
	  popUp.style.width = w + "px";   
	  popUp.style.height = h + "px";
	  
  }